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JEE Main levelOne or more correct optionsDifficulty 2 of 3pb172

Select the correct statement(s) about boric acid.

  1. AOn heating to about 370 K it forms metaboric acid, .
  2. BIn water its acidity arises from formation of by accepting .
  3. CSolid has a layered structure in which planar units are joined by hydrogen bonds.
  4. DIt is a tribasic Bronsted acid because it has three groups, and so forms three series of sodium salts by direct neutralisation.

Answer: A, B, C

The layered hydrogen-bonded structure, loss of water to near 370 K, and the Lewis acid mode are all correct. The groups are not ionised as protons, so it is monobasic, and the fourth statement is false.
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